Alector, Inc. — Director's Dealing 2020

Feb 6, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alector, Inc. (ALEC)
CIK: 0001653087
Period of Report: 2020-02-04

Reporting Person: Yu Calvin (Vice President, Finance)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-02-04	Common Stock	M	13541	$8.16	Acquired	188835	Direct
2020-02-04	Common Stock	S	63541	$30.04	Disposed	125294	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-02-04	Stock Option (right to buy)	$8.16	M	13541	Disposed	2028-07-01	Common Stock (13541)	Direct

Footnotes

F1: The sales reported by the Reporting Person were effected pursuant to a Rule 10b5-1 trading plan.

F2: The sale price reported in column 4 of Table I represents the weighted average sale price of the shares purchased ranging from $30.00 to $30.11 per share. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

F3: One forty-eighth (1/48th) of the shares subject to the option vested on August 2, 2018, and an additional one forty-eighth (1/48th) of the shares subject to the option shall vest each month thereafter.